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- From: donohoe@jemez.eece.unm.edu
- Newsgroups: comp.soft-sys.khoros
- Subject: Non rectangular ROI
- Message-ID: <41668@pprg.eece.unm.edu.pprg.unm.edu>
- Date: 15 Nov 92 18:34:42 GMT
- Sender: news@pprg.unm.edu
- Lines: 52
-
-
- In "non-rectangular ROI- *HOW*?"
- ph@physiol.ox.ac.uk (Patrick Haggard) writes
-
-
- : Hi. The title says it all. I would like to extract a
- : non-rectangular, and preferably freehand, ROI. Has anyone
- : any tips?
- : - --------------------------------------------------------------------------
- : Patrick Haggard Email (WORLD): ph@physiol.ox.ac.uk
- : University Laboratory of Physiology Email (JANET): ph@uk.ac.ox.physiol
- : Parks Road, Tel. (0865) 272116
- : Oxford, OX1 3PT Fax. (0865) 272469
- : England
- : - --------------------------------------------------------------------------
-
-
- Patrick:
-
- This is not a very satisfactory solution, but when I want to do non-
- trivial interactive image processing such as that which you describe,
- I convert my images to TIFF (viff2tiff), ftp them to my Macintosh, and
- work in Adobe Photoshop. Then I ftp them back to the workstation, run
- 'tiff2viff', and finish the job in Khoros.
-
- Khoros is more-or-less constrained to
- work with rectangular images; the usual way to deal with non-rectangular
- regions of interest is with a mask image. (In my greyscale morpho
- routines, I combine the mask or 'background' with the ROI or 'foreground'
- in the same file by making the background pixels negative. This is not
- a very general solution.)
-
- Unfortunately, since the VIPL library is a somewhat loose collection of
- routines contributed by many individuals, only a few of the routines
- incorporate the masking idea.
-
- Maybe the Khoros Group have some plans for more flexible ROI operations
- up their collective sleeve.
-
- Cheers,
-
- Greg D.
-
- =================================================================
- Gregory W. Donohoe, Ph.D., Assistant Prof.
- Electrical and Computer Engineering
- University of New Mexico Tel: 505-277-6724
- Albuquerque, NM 87131 email: donohoe@chama.eece.unm.edu
-
- News flash: "Eating causes cancer!"
- =================================================================
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-